Parallel
Proverbs 27:22
Swete's Septuagint · Berean Standard Bible
ἐὰν μαστιγοῖς ἄφρονα ἐν μέσῳ συνεδρίου ἀτιμάζων, οὐ μὴ περιέλῃς τὴν ἀφροσύνην αὐτοῦ.
Though you grind a fool like grain with mortar and a pestle, yet his folly will not depart from him.